sparrow hole size?

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ron20m
Posts: 446
Joined: Sat Jul 03, 2004 3:01 pm
Location: Oklahoma/Norman

trying modify couple gourds into sparrow traps
what size hole do i need?
John Miller
Posts: 4771
Joined: Mon Mar 22, 2004 9:11 pm
Location: St. Louis, MO

1.5 inches round. This will restrict most martins. To absolutely restrict martins out and still admit house sparrows, you can go 1/16 smaller, which if my brain is working is 1 7/16. I think maybe even 1 1/4, but not sure.
MamaBruff
Posts: 1466
Joined: Wed Mar 06, 2013 12:21 pm
Location: SW Missouri
Martin Colony History: 2013-2016 Unsuccessful at starting a PM colony. Health problems.
Rehomed all my PM stuff. Good Luck and Best Wishes to All.

John is right. And if you want to exclude BBs and TRES also, use 1 5/16th" hole as described below. Scientifically tested and proven in the hills of the Show Me State by our own Kathy Freeze... Here's a tidbit that she taught me (She is a hero) and she has it in her blog. It was also featured in a PMCA Update 2014 magazine.
http://kathyfreeze.blogspot.com/2015_02_01_archive.html
I had a problem with the blue birds and tree swallows insisting on trying to nest here (in a BB house converted to HOSP trap), so I finally closed down the box on the right and cut a smaller hole out of a sour cream lid, then duct-taped it over the larger hole on the door. I used a 1 3/8″ Forstner bit to cut the hole in the plastic lid, but as the bluebirds were still squeezing in, I adjusted the hole down another 1/16″ by sliding the lid over the door edge. That did the trick! So, the net effect is 1 5/16″ hole. Since then, I’ve only caught HOSP in this trap .... it is very, very effective.
... It worked for me too! :grin:
Good Luck and Keep on Trappin'!!
~Mary B~

Lifelong PM Admirer and Nature Enthusiast.
Ruthless trapper of S&S year round.
2013-2016 Unsuccessful at starting a PM colony. Health problems.
Rehomed all my PM stuff. Good Luck and Best Wishes to All.
ron20m
Posts: 446
Joined: Sat Jul 03, 2004 3:01 pm
Location: Oklahoma/Norman

I rarely have BB, too urban. And the sparrows are thick this year.
Bill Hyde
Posts: 287
Joined: Sat May 08, 2004 8:59 am
Location: Illinois/Roscoe

Try 1-1/4". It has worked well for me.
PMCA member
2011 - 1 SY pair w/ 2 HY fledged
2012 - 5 breeding pairs
2013 - 14 nesting pairs and several singles
2014 - 8 nesting pairs
2015 - 5 nesting prs w/mostly ASY parents
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